Parul Polytechnic Institute Subject Code : 3341101 Name Of Subject : Microprocessor and assembly language programming Name of Unit : Introduction to Microprossor.

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Parul Polytechnic Institute Subject Code : Name Of Subject : Microprocessor and assembly language programming Name of Unit : Introduction to Microprossor Topic : Pin function of 8085 Name of Faculty : H.M.Avaiya & Bhargav Halari

The 8085 Bus Structure  The 8-bit 8085 CPU (or MPU – Micro Processing Unit) communicates with the other units using a 16- bitaddress bus, an 8-bit data bus and a control bus.

The 8085 Bus Structure Data Bus  Consists of 8 data lines: D0 – D7Operates in bidirectional mode: The data bits are sent from the MPU to peripheral devices, as well as from the peripheral devices to the MPU. Data range: 00 (hex) – FF (hex) Control Bus  Consists of various lines carrying the control signals such as read / write enable, flag bits.

Address Bus  Consists of 16 address lines: A0 – A15  Operates in unidirectional mode: The address bits are always sent from the MPU to peripheral devices, not reverse.  16 address lines are capable of addressing a total of 216 = 65,536 (64k) memory locations.  Address locations: 0000 (hex) – FFFF (hex)